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采用磷酸镁水泥(MPC)对铅污染土进行固化/稳定化处理。基于无侧限抗压强度试验,系统地研究了MPC添加量、养护龄期、水土比和污染土铅含量对固化污染土应力-应变特性的影响规律。结果表明,固化污染土的应力-应变曲线呈现出3个阶段,即压密阶段、弹性阶段和破坏阶段;随着MPC添加量和养护龄期的增加,固化污染土的抗压强度qu增大,变形模量E_50增大,破坏应变ε_f减小;水土比和铅含量对固化土的抗压强度q_u和E50均存在临界值,分别为0.45和500mg/kg,低于临界值时,固化土的qu和E50随着铅含量和水土比的增加而增加,ε_f随着q_u增加呈幂函数规律减小,E_50随着qu的增加呈线性增加,E50随着ε_f的增加呈幂函数规律减小。
Magnesium phosphate cement (MPC) is used to cure / stabilize lead contaminated soil. Based on the unconfined compressive strength test, the effect of MPC dosage, curing age, water-soil ratio and lead content in contaminated soil on the stress-strain behavior of solidified contaminated soils was systematically investigated. The results show that the stress-strain curve of solidified contaminated soil shows three stages, that is, compaction stage, elastic stage and failure stage. With the addition of MPC and curing age, the compressive strength qu of solidified contaminated soil increases , The deformation modulus E_50 increases and the strain εε decreases. The critical values of compressive strength q_u and E50 for soil moisture and soil lead and lead content are 0.45 and 500 mg / kg, respectively. Below the critical value, Qu and E50 increased with the increase of Pb and water to soil ratio, ε_f decreased with the increase of q_u, E_50 increased linearly with qu, while E50 decreased with the increase of ε_f .